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    CVE-2026-121943

    Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.

    Published:Nov 4, 2026
    Last Modified:Nov 4, 2026
    EPS:Nov 4, 2026
    EPSS Score:
    CVSS Score:4.8

    Affected Products

    Vendor
    Irontec
    Product
    Sngrep

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-170 Improper Null Termination

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-121944 (CVSS 6.8) — sngrep through 1.9.0 contains an infinite loop vulnerability in capture_packet_reasm_ip() in src/capture.c tha…
    CVE-2026-90558 (CVSS 9.3) — sngrep through 1.8.4 contains stack buffer overflow vulnerabilities in SIP attribute formatting routines when …
    CVE-2024-35434 (CVSS 7.5) — Irontec Sngrep v1.8.1 was discovered to contain a heap buffer overflow via the function rtp_check_packet at /s…
    CVE-2024-3120 (CVSS 9) — A stack-buffer overflow vulnerability exists in all versions of sngrep since v1.4.1. The flaw is due to inadeq…
    CVE-2024-3119 (CVSS 9) — A buffer overflow vulnerability exists in all versions of sngrep since v0.4.2, due to improper handling of 'Ca…
    CVE-2023-36192 (CVSS 7.8) — Sngrep v1.6.0 was discovered to contain a heap buffer overflow via the function capture_ws_check_packet at /sr…
    CVE-2023-31982 (CVSS 7.8) — Sngrep v1.6.0 was discovered to contain a heap buffer overflow via the function capture_packet_reasm_ip at /sr…
    CVE-2023-31981 (CVSS 7.8) — Sngrep v1.6.0 was discovered to contain a stack buffer overflow via the function packet_set_payload at /src/pa…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High